Upsert does not add new one when document doesn't exist (ElasticSearch) - elasticsearch

Question

I am creating new docs like this:
PUT test/_doc/1
{
"counter" : 1,
"tags" : "red"
}
Now I want to update or insert document whether or not it already exists:
POST test/_update/2
{
"script" : {
"source": "ctx._source.counter += params.count",
"lang": "painless",
"params" : {
"count" : 4
}
},
"upsert" : {
"counter" : 1
}
}
In my case, _doc=2 does not exist, for this I added upsert into the query so that it will be created automatically when the _doc does not exist.
Instead, I am getting this error message:
{
"error": {
"root_cause": [
{
"type": "invalid_type_name_exception",
"reason": "Document mapping type name can't start with '_', found: [_update]"
}
],
"type": "invalid_type_name_exception",
"reason": "Document mapping type name can't start with '_', found: [_update]"
},
"status": 400
}
Did I misunderstand how it works please?
UPDATE
Mapping:
PUT /test
{
"mappings": {
"type_name": {
"properties": {
"counter" : { "type" : "integer" },
"tags": { "type" : "text" }
}}},
"settings": {
"number_of_shards": 1
}
}
ElasticSearch version: "6.8.4"

Answer 1

try this
you were looking at 7.x documentation
this is the documentation for your version : https://www.elastic.co/guide/en/elasticsearch/reference/6.8/docs-update.html
POST test/type_name/2/_update
{
"script" : {
"source": "ctx._source.counter += params.count",
"lang": "painless",
"params" : {
"count" : 4
}
},
"upsert" : {
"counter" : 1
}
}